[MIPS] Define 'CPU_CISC' for mips as aes calculation is incorrect for 'CPU_RISC'

libsrtp.gyp

Index: libsrtp.gyp
diff --git a/libsrtp.gyp b/libsrtp.gyp
index a3956ebeb7b66fa7fd568245a7237fd2d8bb3ccc..735810f3d18dcefc5b3cb6fb70793198ff24b7c0 100644
--- a/libsrtp.gyp
+++ b/libsrtp.gyp
@@ -46,21 +46,17 @@
           'CPU_CISC',
         ],
       }],
-      ['target_arch=="arm" or target_arch=="armv7" or target_arch=="arm64"', {
+      ['target_arch=="arm" or target_arch=="armv7" or target_arch=="arm64" \
+       or target_arch=="mipsel" or target_arch=="mips64el"', {
         'defines': [
-          # TODO(leozwang): CPU_RISC doesn't work properly on android/arm
-          # platform for unknown reasons, need to investigate the root cause
-          # of it. CPU_RISC is used for optimization only, and CPU_CISC should
-          # just work just fine, it has been tested on android/arm with srtp
-          # test applications and libjingle.
+          # TODO(leozwang): CPU_RISC doesn't work properly on android/arm and
+          # mips platforms for unknown reasons, need to investigate the root
+          # cause of it. CPU_RISC is used for optimization only, and CPU_CISC
+          # should just work just fine, it has been tested on android/arm with
+          # srtp test applications and libjingle.
           'CPU_CISC',
         ],
       }],
-      ['target_arch=="mipsel" or target_arch=="mips64el"', {
-        'defines': [
-          'CPU_RISC',
-        ],
-      }],
       ['target_arch=="mipsel" or target_arch=="arm" or target_arch=="armv7" or target_arch=="ia32"', {
         'defines': [
           # Define FORCE_64BIT_ALIGN to avoid alignment-related-crashes like
@@ -108,11 +104,6 @@
             'CPU_CISC',
           ],
         }],
-        ['target_arch=="mipsel" or target_arch=="mips64el"', {
-          'defines': [
-            'CPU_RISC',
-          ],
-        }],
       ],
     },
   },